from AR (comparing OMNA old formula to Sust250)
the individual substances of Omnadren and Sustanon are not completely identical. Both include testosterone phenylpropionate and testosterone propionate; however, the tes-tosterone isocaproate in Sustanon is replaced by testosterone hexanoate and the testosterone decanoate in Omnadren is replaced by testosterone hexanoate in Sustanon
I prefer Karchi Sust myself